Comprehensive questions
1. State and explain coulombs law. Do include the case when the charges are
placed in dielectrics. Discuss how the unit of charge coulomb is defined?
2. Explain the concept of electric field and hence define electric field
intensity. Discuss the direction as well as the unit of Ē
3. Explain the concept of electric flux. Using mathematical expressions of
electric flux to show that how electric flux is maximum and minimum.
Chapter 11
Electrostatics
Answers
Answer:
1) coulomb's law states that electrostatic force between two point charges is
1) directly proportional to product of two charges.
2) universally proportional to square of distance between them ( charges ).
F = k 1 / 4π£°. qq°/ R2
where ' r' is the distance between two charges.
k is a constant it' s value depends upon the nature of medium
for air or vacuum
k= 1/4π£°
2) Electric field :- space or resion around the charge in which electrostatic force due to that charge can be experienced, is called as electric field
E = F / q
where
F - electrostatic force
q - charge in medium .
for vacuum q = q°
3) Electric flux :- It is the number of measure electric field lines passing through a surface normally.
It is denoted by ( fie)
fie = E .dA
electric flux will be maximum when the angle between electric field and surface area will be maximum other wise angle will be minimum